On updating hiking singles dating
ON UPDATE CASCADE should simplify this process by automating part of the process.It's an excellent question, I had the same question yesterday.I thought about this problem, specifically SEARCHED if existed something like "ON UPDATE CASCADE" and fortunately the designers of SQL had also thought about that.I agree with Ted.strauss, and I also commented Noran's case. Like Ted pointed out, when you are treating several databases at one time, and the modification in one of them, in one table, has any kind of reproduction in what Ted calls "satellite database", can't be kept with the very original ID, and for any reason you have to create a new one, in case you can't update the data on the old one (for example due to permissions, or in case you are searching for fastness in a case that is so ephemeral that doesn't deserve the absolute and utter respect for the total rules of normalization, simply because will be a very short-lived utility) So, I agree in two points: (A.) Yes, in many times a better design can avoid it; BUT (B.) In cases of migrations, replicating databases, or solving emergencies, it's a GREAT TOOL that fortunately was there when I went to search if it existed. Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site (the association bonus does not count).
Zed made a good point, that if you use a natural key (e.g.
This is not the case if you choose to use surrogate (e.g.
artifically system-generated) keys as your primary key (which would be my preferred choice in all but the most rare occasions).
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